LM3477AMMX Equivalent & Substitute Parts

Part Overview

The LM3477AMMX is a Buck, Buck-Boost Regulator Positive Output Step-Down DC-DC Controller IC manufactured by Texas Instruments in 8-VSSOP packaging. This device functions as a transistor driver for step-down DC-DC conversion with a single output phase and positive output configuration. The main part is classified as Obsolete, making identification of equivalent and substitute parts essential for design continuity and procurement planning. Substitute parts maintain identical electrical and mechanical specifications while offering improved product status and availability.

Substiute Parts

LM3477AMMX

Texas InstrumentsIn Stock: 2188LM3477AMMX Datasheet

Current PartRFQ

LM3477AMMX/NOPB

National SemiconductorIn Stock: 3344LM3477AMMX/NOPB Datasheet

DirectRFQ

LM3477AMM/NOPB

National SemiconductorIn Stock: 7387LM3477AMM/NOPB Datasheet

Parametric EquivalentRFQ

LM3477MM/NOPB

Texas InstrumentsIn Stock: 5628LM3477MM/NOPB Datasheet

Parametric EquivalentRFQ

LM3477MMX

Texas InstrumentsIn Stock: 2317LM3477MMX Datasheet

Parametric EquivalentRFQ

LM3477MMX/NOPB

National SemiconductorIn Stock: 4168LM3477MMX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM3477AMMX are classified based on strict parametric equivalence. All substitute parts maintain identical electrical specifications across the following critical parameters: topology (Buck, Buck-Boost), output type (Transistor Driver), function (Step-Down), output configuration (Positive), number of outputs (1), output phases (1), supply voltage range (2.97V ~ 35V), switching frequency (500kHz), maximum duty cycle (93%), operating temperature range (-40°C ~ 125°C), and package configuration (8-TSSOP, 8-MSOP, 8-VSSOP).

Substitutes are differentiated by product status, packaging format (Bulk or Tape & Reel), and manufacturer designation. The LM3477AMMX/NOPB and LM3477AMM/NOPB variants are classified as Direct Manufacturer and Parametric Equivalent parts respectively, both manufactured by National Semiconductor with Active product status. The LM3477MM/NOPB and LM3477MMX variants are manufactured by Texas Instruments with Active and Last Time Buy status respectively. The LM3477MMX/NOPB is a Parametric Equivalent manufactured by National Semiconductor with Active status.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the LM3477AMMX (Obsolete status), the LM3477AMMX/NOPB and LM3477AMM/NOPB are recommended as primary substitutes due to their Active product status and full parametric equivalence. The LM3477AMMX/NOPB offers the highest inventory availability at 3322 units with Bulk packaging, suitable for high-volume procurement. The LM3477AMM/NOPB provides the largest inventory reserve at 7320 units, offering extended supply security.

For applications requiring Tape & Reel packaging format, the LM3477MM/NOPB (Texas Instruments, Active status, 5565 units) is the preferred selection. The LM3477MMX remains available with Last Time Buy status and should be considered only for immediate requirements, as this designation indicates limited future availability.

All substitute parts maintain identical electrical performance specifications and package configurations. Selection should prioritize Active product status variants to ensure long-term supply continuity and support availability.

Frequently Asked Questions (FAQ)

Q: What makes the LM3477AMMX/NOPB a direct substitute for the LM3477AMMX? A: The LM3477AMMX/NOPB maintains identical electrical specifications including topology, supply voltage range (2.97V ~ 35V), switching frequency (500kHz), duty cycle (93%), operating temperature range (-40°C ~ 125°C), and 8-VSSOP package configuration. The primary difference is product status (Active vs. Obsolete) and manufacturer designation.

Q: Are all substitute parts pin-compatible with the original LM3477AMMX? A: Yes. All substitute parts use the identical 8-VSSOP package configuration with the same pinout, mounting type (Surface Mount), and physical dimensions (0.118", 3.00mm Width). Direct PCB replacement is supported without layout modifications.

Q: What is the difference between Bulk and Tape & Reel packaging options? A: Bulk packaging (LM3477AMMX/NOPB, LM3477AMM/NOPB) is suitable for lower-volume applications and manual assembly processes. Tape & Reel packaging (LM3477MM/NOPB, LM3477MMX) is optimized for automated pick-and-place assembly and high-volume production environments.

Q: Why should I avoid the LM3477MMX despite its availability? A: The LM3477MMX carries Last Time Buy status, indicating that Texas Instruments has announced end-of-life for this variant. While currently available, future procurement may become impossible. Active status variants (LM3477AMMX/NOPB, LM3477AMM/NOPB, LM3477MM/NOPB, LM3477MMX/NOPB) provide assured long-term supply.

Q: Can I mix different substitute part numbers in the same design revision? A: All substitute parts are parametrically equivalent and functionally interchangeable. However, for manufacturing consistency and traceability, it is standard practice to specify a single part number per design revision and document any approved substitutes in the bill of materials.

Q: What compliance certifications apply to these substitute parts? A: All parts share identical ECCN (EAR99), HTSUS (8542.39.0001), and REACH Unaffected status. The LM3477MM/NOPB and LM3477MMX variants are ROHS3 Compliant. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all variants, indicating no moisture precautions are required during storage or handling.